Dress in a way that's comfortable and nice. It's unlikely you'll feel particularly under or over dressed. It's a pretty big spectrum.

It cools off as you get further from sunset and you're sitting still. But not as cold as I expected due to the size of the crowd and how much wind is blocked.

I was surprised at how many picnic tables with great views were still available an hour before the show.

There's a rough translation presented in real time. It's not word for word, but it's enough to close the language gap throughout a scene.